1. Cronstedt JL: Gerigte Biopsiee met die Glasveselgastroskoop. MD-thesis, University of Pretoria, Pretoria, 1971
2. Applied anatomy and physiology of the stomach.;Cummins,1963
3. Leitfaden der Gastroskopie;Brühl,1962
4. Lehrbuch und Atlas der Gastroskopie;Brühl,1969
5. Correlations of gross gastroscopic findings with gastroscopic biopsy in gastritis;Atkins;New Engl J Med,1956